In 2012, Sarah earned $67,100 per year as a law professor. She would have earned the same salary in 2013, but she got tired of teaching law students and decided to start her own law firm. Her law firm began operations on January 1, 2013. Revenue from the law business was $240,000 in 2013. Sarah also hired Donna to work part time and paid her a total of $30,000 that year. Sarah's other business expenses for 2013 totalled $22,000. The business was located in a building Sarah owns and had rented to others prior to 2013; she had earned rental income of $13,800 from this property in 2022. Comparing her income and expenses in 2012 and 2013, determine the implicit monetary cost (in $) for Sarah of her decision to give up teaching in 2013. Enter your response as an integer: do NOT use decimals 

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